gwd-6 求助

cassieluo750

Scientists have made genetic modifications to cotton to increase its resistance to insect pests.  According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.  Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.

 

Which of the following would it be most useful to know in order to evaluate the argument?

 

1. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed
2. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops
3. Whether for most farmers who grow cotton it is their primary crop
4. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did
5. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide

   Answer: bd

答案是d  请问b为什么不对?

SPARTAN_117

参见以下讨论，

http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=2038867&id=83238&page=1&skin=0&Star=1

建议看之前做好准备活动，最好带瓶氧气。本人的答案在第16页，但那只是一家之言，仅供参考。

[此贴子已经被作者于2007-2-9 14:33:04编辑过]

gavenhan

B的选项涉及其他crops，是无关内容，肯定排除。

cassieluo750

好像争议很多哦~~

SPARTAN_117

是很多，我想主要原因在于最初给出正确答案的作者没有采用最有说服力的推理，引起后来许多人的疑问并将问题越搞越复杂。

[此贴子已经被作者于2007-2-9 16:42:11编辑过]